<template>
    <div>
        <!-- 面包屑导航区 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图区 -->
        <el-card>
            <!-- 提示区域 -->
            <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
            <!-- 步骤条 -->
            <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>

            <!-- tab页签区 -->
            <el-form
                :model="addForm"
                :rules="addFormRules"
                ref="addFormRef"
                label-width="100px"
                label-position="top"
            >
                <el-tabs
                    v-model="activeIndex"
                    :tab-position="'left'"
                    :before-leave="beforeTabLeave"
                    @tab-click="tabClicked"
                >
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                            <el-cascader
                                :options="cateList"
                                :props="cateProps"
                                v-model="addForm.goods_cat"
                                @change="handleChange"
                            ></el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <!-- 渲染表单的Item项 -->
                        <el-form-item
                            :label="item.attr_name"
                            v-for="item in manyTableData"
                            :key="item.attr_id"
                        >
                            <!-- 复选框组 -->
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox
                                    :label="cb"
                                    v-for="(cb,i) in item.attr_vals"
                                    :key="i"
                                    border
                                ></el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item
                            :label="item.attr_name"
                            v-for="item in onlyTableData"
                            :key="item.attr_id"
                        >
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <!-- action表示图片要上传到的后台API地址 -->
                        <el-upload
                            :action="uploadURL"
                            :on-preview="handlePreview"
                            :on-remove="handleRemove"
                            list-type="picture"
                            :headers="headerObj"
                            :on-success="handleSuccess"
                        >
                            <el-button size="small" type="primary">点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <!-- 富文本编辑器 -->
                        <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                        <!-- 添加商品的按钮 -->
                        <el-button type="primary" class="btn-add" @click="add">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>

        <!-- 图片预览 -->
        <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
            <img :src="previewPath" alt class="previewImg" />
        </el-dialog>
    </div>
</template>

<script>
import _ from "lodash";

export default {
    data() {
        return {
            activeIndex: "0",
            //添加商品的表单数据对象
            addForm: {
                goods_name: "",
                goods_price: 0,
                goods_weight: 0,
                goods_number: 0,
                //商品所属的的分类数组
                goods_cat: [],
                //图片的数组
                pics: [],
                //商品的详情描述
                goods_introduce: "",
                attrs: []
            },
            //添加商品的表单验证对象
            addFormRules: {
                goods_name: [
                    {
                        required: true,
                        message: "请输入商品名称",
                        trigger: "blur"
                    }
                ],
                goods_price: [
                    {
                        required: true,
                        message: "请输入商品价格",
                        trigger: "blur"
                    }
                ],
                goods_weight: [
                    {
                        required: true,
                        message: "请输入商品价格",
                        trigger: "blur"
                    }
                ],
                goods_number: [
                    {
                        required: true,
                        message: "请输入商品数量",
                        trigger: "blur"
                    }
                ],
                goods_cat: [
                    {
                        required: true,
                        message: "请选择商品分类",
                        trigger: "blur"
                    }
                ]
            },
            //商品分类数据
            cateList: [],
            cateProps: {
                label: "cat_name",
                value: "cat_id",
                children: "children",
                expandTrigger: "hover"
            },
            //动态参数列表
            manyTableData: [],
            //静态属性列表
            onlyTableData: [],
            //上传图片的URL地址,这里需要绝对路径
            uploadURL: "http://119.23.53.78:8888/api/private/v1/upload",
            //图片上传组件的header请求头对象
            headerObj: {
                Authorization: window.sessionStorage.getItem("token")
            },
            previewPath: "",
            //控制图片预览弹出框
            previewVisible: false
        };
    },
    created() {
        this.getCateList();
    },
    methods: {
        async getCateList() {
            const { data: res } = await this.$http.get("categories");
            if (res.meta.status !== 200) {
                return this.$message.error("获取商品分类数据失败");
            }
            this.cateList = res.data;
        },
        //级联选择器选中项变化触发
        handleChange() {
            if (this.addForm.goods_cat.length !== 3) {
                this.addForm.goods_cat = [];
            }
        },
        //tab标签页切换标签之前的钩子函数
        beforeTabLeave(activeName, oldActiveName) {
            if (oldActiveName === "0" && this.addForm.goods_cat.length !== 3) {
                this.$message.error("请选择商品分类");
                return false;
            }
        },
        //tab标签页点击事件
        async tabClicked() {
            //证明访问的是动态参数面板
            if (this.activeIndex === "1") {
                const { data: res } = await this.$http.get(
                    `categories/${this.cateId}/attributes`,
                    {
                        params: {
                            sel: "many"
                        }
                    }
                );
                //要在第一个if语句中进行判断，因为const声明的变量是块级作用域的，只能在本if语句中使用
                if (res.meta.status !== 200) {
                    return this.$message.error("获取动态参数列表失败");
                }

                res.data.forEach(item => {
                    item.attr_vals.length === 0
                        ? []
                        : item.attr_vals.split(" ");
                });
                this.manyTableData = res.data;
            } else if (this.activeIndex === "2") {
                const { data: res } = await this.$http.get(
                    `categories/${this.cateId}/attributes`,
                    {
                        params: {
                            sel: "only"
                        }
                    }
                );
                //要在第一个if语句中进行判断，因为const声明的变量是块级作用域的，只能在本if语句中使用
                if (res.meta.status !== 200) {
                    return this.$message.error("获取静态属性列表失败");
                }

                res.data.forEach(item => {
                    item.attr_vals.length === 0
                        ? []
                        : item.attr_vals.split(" ");
                });
                this.onlyTableData = res.data;
            }
        },
        //处理图片预览效果
        handlePreview(file) {
            console.log(file);
            this.previewPath = file.response.data.url;
            this.previewVisible = true;
        },
        //处理移除图片的操作
        handleRemove(file) {
            //1.获取将要删除的图片的临时路径
            const filePath = file.response.data.tmp_path;
            //2.从pics数组中，找到这个图片对应的索引值
            const i = this.addForm.pics.findIndex(x => x.pic === filePath);
            //3.调用数组的splice方法，把图片信息对象，从pics数组中移除
            this.addForm.pics.splice(i, 1);
        },
        //监听图片上传成功的事件
        handleSuccess(response) {
            //1.拼接得到一个图片信息对象
            const picInfo = { pic: response.data.tmp_path };
            //2.将图片信息对象，push到pics数组中
            this.addForm.pics.push(picInfo);
        },
        //添加商品
        add() {
            this.$refs.addFormRef.validate(async valid => {
                if (!valid) {
                    return this.$message.error("请填写必要的表单项");
                }
                //执行添加的业务逻辑
                //lodash cloneDeep(obj)进行深拷贝,因为级联选择器需要数组型数据
                const form = _.cloneDeep(this.addForm);
                form.goods_cat = form.goods_cat.join(",");

                //处理动态参数
                this.manyTableData.forEach(item => {
                    const newInfo = {
                        attr_id: item.attr_id,
                        attr_value: item.attr_vals.join(" ")
                    };
                    this.addForm.attrs.push(newInfo);
                });
                //处理静态属性
                this.onlyTableData.forEach(item => {
                    const newInfo = {
                        attr_id: item.attr_id,
                        attr_value: item.attr_vals
                    };
                    this.addForm.attrs.push(newInfo);
                });
                form.attrs = this.addForm.attrs;

                //发起请求添加商品
                //商品的名称，必须是唯一的
                const { data: res } = await this.$http.post("goods", form);
                if (res.meta.status !== 201) {
                    return this.$message.error("添加商品失败");
                }
                this.$message.success("添加商品成功");
                this.$router.push("/goods");
            });
        }
    },
    computed: {
        cateId() {
            if (this.addForm.goods_cat.length === 3) {
                return this.addForm.goods_cat[2];
            }
            return null;
        }
    }
};
</script>

<style lang="less" scoped>
.el-steps {
    margin: 15px 0;
}
.el-step__title {
    font-size: 12px;
}
.el-checkbox {
    margin: 0 10px 0 0 !important;
}
.previewImg {
    width: 100%;
}
.btn-add {
    margin-top: 15px;
}
</style>